Ana Ivanovic of Serbia returns a shot against Kim Clijsters of Belgium during her women's singles match on day seven of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 5, 2010 in the Flushing neighborhood of the Queens borough of New York City

Bethanie Mattek takes part in her Women's Doubles Quarter Finals during day nine of the 2007 U.S. Open at the Billie Jean King National Tennis Center on September 4, 2007

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Caroline Wozniacki of Denmark celebrates after defeating Dominika Cibulkova of Slovakia during her women's single quarterfinal match during day ten of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 8, 2010

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Daniela Hantuchova of Slovakia hits a forehand return against Elena Dementieva of Russia during her women's singles match on day five of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 3, 2010

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Dominika Cibulkova of Slovakia serves to number 11 seeded Svetlana Kuznetsova of Russia at the US Open 2010 tennis tournament at the USTA Billie Jean King National Tennis Center September 6, 2010

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Jarmila Groth of Australia serves against Maria Sharapova of Russia during her women's singles first round match on day two of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on August 31, 2010

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Jelena Jankovic of Serbia returns a shot against Kaia Kanepi of Estonia during her women's singles third round match on day six of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 4, 2010

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Jelena Jankovic of Serbia returns a forehand against Kaia Kanepi of Estonia during her women's singles third round match on day six of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 4, 2010

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Vera Zvonareva of Russia returns a shot against Kaia Kanepi of Estonia during her women's singles quarterfinal match on day ten of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 8, 2010

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Maria Sharapova pictured during her match against Iveta Benesova at Flushing Meadows during the 2010 US Open Tennis Tournament in New York City.

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Maria Sharapova pictured during her match against Iveta Benesova at Flushing Meadows during the 2010 US Open Tennis Tournament in New York City.

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Nadia Petrova of Russia in action with Liezel Huber of the United States against Lisa Raymond of the United States and Rennae Stubbs of Australia during their women's doubles quarterfinals match on day ten of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 8, 2010

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Samantha Stosur of Australia hits a return against Elena Dementieva of Russia during her women's singles match on day seven of the 2010 U.S. Open at the USTA Billie Jean King National Tennis Center on September 5, 2010

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Serena Williams loses to Jennifer Capriati in the quarter finals of the women's singles September 7, 2004 at the 2004 US Open in New York

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Serena Williams at the US Open in 2004

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Serena Williams warms up in would-be boots in the second round of the women's singles September 1, 2004 at the 2004 US Open in New York

Venus Williams waits to return the ball to Russia's Nadia Petrova during their women's fourth round match in the French Open tennis championship at the Roland Garros stadium, on May 30, 2010, in Paris.

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Venus Williams Number three seed Venus Williams of the US reacts against sixteen seed Shahar Peer from Israel during their US Open 2010 match at the USTA Billie Jean King National Tennis Center in New York September 5,2010.

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Venus Williams The outfit of number htree seed Venus Williams of the US against sixteenth seed Shahar Peer from Israel during their US Open 2010 match at the USTA Billie Jean King National Tennis Center in New York September 5,2010.